The duration that your character may breathe underwater for before drowning.

In-game Description: Affects how much Fatigue you have, your Health, and how much your Health will increase when you sleep and raise levels. Governs the skills of Block, Armorer, and Heavy Armor.

If your Endurance is increased while leveling, your health will increase both because the base health has increased and because of the health increase on leveling. In other words, base health is recalculated at each level-up after applying any Endurance gains.

The health gain each time you level is dependent upon the current value of your endurance; this increase is not retroactive. Therefore to get maximum health you need to raise your endurance to 100 as quickly as possible. To illustrate, the following table compares the health for five characters who all reach 100 endurance by level 20.

Level

Case 1

Case 2

Case 3

Case 4

Case 5

Endur.

Health

Endur.

Health

Endur.

Health

Endur.

Health

Endur.

Health

1

30

60

30

60

60

120

60

120

60

120

2

35

73

30

63

65

136

60

126

60

126

3

40

87

30

66

70

153

60

132

60

132

4

45

101

30

69

75

170

60

138

60

138

5

50

116

30

72

80

188

60

144

60

144

6

55

131

30

75

85

206

60

150

60

150

7

60

147

35

88

90

225

60

156

60

156

8

65

163

40

102

95

244

65

172

60

162

9

70

180

45

116

100

264

70

189

60

168

10

75

197

50

131

100

274

75

206

60

174

11

80

215

55

146

100

284

80

224

60

180

12

85

233

60

162

100

294

85

242

60

186

13

90

252

65

178

100

304

90

261

65

202

14

95

271

70

195

100

314

95

280

70

219

15

100

291

75

212

100

324

100

300

75

236

16

100

301

80

230

100

334

100

310

80

254

17

100

311

85

248

100

344

100

320

85

272

18

100

321

90

267

100

354

100

330

90

291

19

100

331

95

286

100

364

100

340

95

310

20

100

341

100

306

100

374

100

350

100

330

The minimum Endurance you can start with is 30 and the maximum is 65. Between these two characters, there will be a 37 point difference in maximum health as long as both max out their Endurance as soon as possible. If, however, you neglect to level endurance until as late as possible, a character following the efficient leveling guide, with the maximum level of 46, will have between 384 and 486 health, a deficit of over 100 to a character who started with 30 endurance and maximized it by level 15.

Any Fortify Endurance effect will also provide a health increase (equal to two times the endurance boost). These effects will not modify the health received when you level.

Conversely, Damage Endurance or Drain Endurance effects cast upon you will decrease your health. In the case of Damage Endurance, this is substantially more expensive than directly casting a Damage Health spell. On the other hand, Drain Endurance is effectively cheaper than Drain Health (although obtaining access to the Drain Endurance effect is very difficult, and draining Endurance only amounts to a temporary decrease in health).

However, using a Damage Endurance or Drain Endurance effect upon NPCs does not decrease their health.